RuneScape Modeling

I've started modeling for Runescape (508) yesterday, but I'm having a bit of trouble on how models on Runescape's client actually work.

So, I already have the files I need ( *\rs_client\files\models ). A thousand or so .RAR files are in there. How do I know which model is in what archive? I've been told that the server's item.cfg file (which I have) has all the items listen with the item's number, but I've tried and it doesn't have the right corresponding .RAR filename.

Is there an easy way on finding the model you want in the right .RAR folder?

they should correspond to the number, mate, since that's how the client pulls them. You must have a custom one, with different item placement